The PY80 is a half wave rectifier for television HT systems.
The maximum reservoir capacitor is 60 µF, and the minimum series resistance has to be 45 Ohms.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 67 mm tall.
References: Datasheet, 3002 & 1040. Type PY82 was first introduced in 1951.